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EC number: 222-048-3
CAS number: 3327-22-8
The reaction of CHPTAC in neutral and alkaline pH does not
correctly fit into the definition of hydrolysis but the
reaction is more a conversion reaction.
As the degradation reaction is a reaction of CHPTAC with
OH-ions, the ln c/time plot is not linear and the pH was
decreasing with time. In order to approximate the rate
constants at the given pH values only those values of the ln
c/time plot were used that corresponded to the target
pH-values (pH +-0.1 target pH 7.8 and 8.4).
pH kobs [h E-1] t1/2 [h]
7.0 1.0 x 10 E-4 6700
7.8 1.4 x 10 E-3 505
8.4 5.4 x 10 E-3 127
The major degradation product was EPTAC, minor amounts were
converted to DHPTAC.
The results of the preliminary test showed that (3-chloro-2-hydroxypropyl)trimethylammonium chloride is stable at pH 4
(degradation < 10 % after 10 days). At pH 9 the abiotic
degradation was > 50 % after 2.4 hours. The main test was only carried out at pH 7.
The results of the preliminary test verify that the hydrolysis reaction is directly influenced by the OH(-)
concentration. Therefore the kinetics of the abiotic
degradation of (3-chloro-2-hydroxypropyl)trimethylammonium
chloride is refered to as base catalysed.
k(obs)-values and the corresponding half lifes from the main
test at pH 7 and extrapolation to 25 °C:
Test Temp. pH 4 t(1/2) pH7 t(1/2) pH9 t(1/2)
1 50 °C - - 0.117 6 h - -
2 35 °C - - 0.008 90 h - -
* 25 °C - > 1 yr 0.001 641 h - < 1 d
The results at 25 °C were calculated from the measured
temperatures (50 and 35°C).
The measured half-life of CHPTAC at pH 7.8
and 12 °C was 21 days.
The reaction of CHPTAC with water is more
complex than a simple first order hydrolysis reaction. In a standard
hydrolysis test conducted according to EC test method C.7 the half-life
at 35 °C and pH 7 was 3.75 days. Extrapolating to environmental
conditions (12 °C)
the corresponding half life is predicted to be 75.5 days.
However, other evidence suggested that true reaction rates under neutral
conditions were faster than this, therefore a study was performed under
environmentally relevant conditions (Raisio, 2004). In this study the
measured half-life of CHPTAC at pH 7.8 and 12 °C was 21 days.
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